net: allow better page reuse in splice(sock -> pipe)
splice() from socket to pipe needs linear_to_page() helper to transfert skb header to part of page. We can reset the offset in the current sk->sk_sndmsg_page if we are the last user of the page. Signed-off-by: NEric Dumazet <edumazet@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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